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English (United States)

This text was extracted from a PDF file.

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Page 01 of 4

MOTORCYCLE TIRE VALVE STEM LOCATOR

The present invention relates to valve stems on the wheels a motorcycle. More particularly, the present invention relates to a system for displaying to a rider whether the valve stems of the wheels are currently accessible and not blocked by obstructions.

Referring to the Figures, the motorcycle includes front and rear wheels, wheel position sensors 1 (one associated with each wheel), an instrument display 4, an electronic control unit (ECU) 5, and saddlebags 6 (one saddlebag positioned on each side of the motorcycle). Each wheel includes a valve stem 2 and a magnetic encoder ring 3.

In one embodiment, anisotropic magnetoresistive (AMR) wheel position sensors 1 and a magnetic encoder ring 3 are used to determine wheel position. Wheel position sensor 1 may comprise two sensing elements that are physically arranged so that as magnetic encoder ring 3 passes by the two sensing elements, the output of the two sensing elements are offset in a way that allows rotational direction to be determined. Furthermore, magnetic encoder ring 3 may have one or more magnetic poles that are of a different size than the other magnetic poles, thus allowing position to be determined. An electronic control unit (ECU) 5 reads the pulse trains produced by wheel position sensors 1 and calculates the position of valve stem 2. The ECU 5 then provides the position information to instrument display 4. An initial calibration procedure may be required to correlate the position of valve stem 2 relative to magnetic encoder ring 3 and to allow ECU 5 to learn which rotational positions of each valve stem 2 are accessible for each wheel. In an alternate implemenation AMR sensors may be replaced with back-biased Hall effect sensors and the magnetic encoder ring may be replaced with a slotted ferrous disk. In another alternate implementation AMR sensors may be replaced with one or more dual-element hall effect sensors, in which case magnetic encoder ring 3 may not have to have one or more poles that are of a different size than the other magnetic poles.

A second embodiment comprises using battery-powered multi-axis accelerometers 7 mounted inside the tire that transmit angular position information to an RF receiver 8. Multi-axis accelerometers are required in o...